FACSIMILE METHOD AND APPARATUS FOR SETTING WHITE LEVEL

A facsimile method and apparatus wherein the white level is set during prescanning in one direction from a first extremity to a second extremity of a document. Scanning then proceeds with the white level set in a second direction from the second extremity to the first extremity. The white level is s...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	WILSON, ARTHUR G, LOGIE, JAMES A
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY PICTORIAL COMMUNICATION, e.g. TELEVISION
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A facsimile method and apparatus wherein the white level is set during prescanning in one direction from a first extremity to a second extremity of a document. Scanning then proceeds with the white level set in a second direction from the second extremity to the first extremity. The white level is set using variable gain amplifier means comprising a digital-to-analog converter and gain control means comprising a digital register which stores a binary word representing the whitest level sensed during prescanning in the first direction.